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Registros recuperados: 3
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Annual Phytoplankton Primary Production Estimation in a Temperate Estuary by Coupling PAM and Carbon Incorporation Methods ArchiMer
Morelle, Jerome; Schapira, Mathilde; Orvain, Francis; Riou, Philippe; Lopez, Pascal Jean; Pierre-duplessix, Olivier; Rabiller, Emilie; Maheux, Frank; Simon, Benjamin; Claquin, Pascal.
Phytoplankton primary production varies considerably with environmental parameters especially in dynamic ecosystems like estuaries. The aim of this study was to investigate short-term primary production along the salinity gradient of a temperate estuary over the course of 1 year. The combination of carbon incorporation and fluorescence methods enabled primary production estimation at short spatial and temporal scales. The electron requirement for carbon fixation was investigated in relation with physical-chemical parameters to accurately estimate primary production at high frequency. These results combined with the variability of the photic layer allowed the annual estimation of primary production along the estuary. Phytoplankton dynamics was closely...
Tipo: Text Palavras-chave: High frequency; Electron requirement for carbon fixation; Electron transport rate (ETR); Seine estuary.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00429/54020/55470.pdf
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Dynamics of exopolymeric carbon pools in relation with phytoplankton succession along the salinity gradient of a temperate estuary (France) ArchiMer
Morelle, Jerome; Schapira, Mathilde; Francoise, Sylvaine; Courtay, Gaelle; Orvain, Francis; Claquin, Pascal.
In parallel to phytoplankton community dynamics, transparent exopolymeric particles (TEP) and exopolymeric substances (EPS) were investigated along the salinity gradient of a temperate estuary (Seine estuary, Normandy, France) over the course of a year. The phytoplankton community was mainly dominated by marine diatom species (especially Skeletonema sp., Nitzschia sp., and Paralia sulcata) associated with a spring bloom of pico-eukaryotes and the development of Cryptophyceae in summer. The decreases in species richness and salinity were correlated along the estuary and a significant exponential relationship between species richness and primary production was identified. Concentrations of TEP and EPS (soluble and bound carbohydrates) are highly dynamic in...
Tipo: Text Palavras-chave: Picophytoplankton; Nanophytoplankton; Exopolymeric substances; Species richness.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00440/55189/56645.pdf
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Dynamics of phytoplankton productivity and exopolysaccharides (EPS and TEP) pools in the Seine Estuary (France, Normandy) over tidal cycles and over two contrasting seasons ArchiMer
Morelle, Jerome; Schapira, Mathilde; Claquin, Pascal.
Exopolysaccharides (EPS) play an important role in the carbon flux and may be directly linked to phytoplankton and microphytobenthos production, most notably in estuarine systems. However the temporal and spatial dynamics of estuarine EPS are still not well understood, nor how primary productivity triggers this variability at these different scales. The aim of this study was to investigate the primary productivity of phytoplankton and EPS dynamics in the Seine estuary over a tidal cycle in three different haline zones over two contrasted seasons. The other objectives was to investigate the origin of pools of soluble carbohydrates (S-EPS) and transparent exopolymeric particles (TEP) in phytoplankton, microphytobenthos or other compartments. High frequency...
Tipo: Text Palavras-chave: Phytoplankton; Microphytobenthos; PAM fluorometer; Electron transport rate.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00400/51132/51898.pdf
Registros recuperados: 3
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